Ratchet torque screw driver



March l1, 1947. w. STORRIE.

RATCHET TORQUE SCREW DRIVER Filed Sept. 29, 1944 .c or sanno x.

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INVENTOR @50W/13@ 'Patented Var. 11, 1947 RATCHET TORQUE SCREW DRIVERWilliam Storrie, Rumford, R. I., assigner to Apco Mossberg Company, acorporation of Massachusetts Application September 29, 1944, Serial No.556,425

Claims. 1

This invention relates to a hand tool, more particularly to a tool whichis twisted about its longitudinal axis for doing work at one end thereofsuch as a screw driver.

in mitico-pending application Ser. No. 529,905, iiled April 7,. 1944, Ihave illustrated a torque screw driver which illustrates generally thesubject matter of this invention. l lind, however, that ywhen aninstrument of this character is utilized where a considerable amount oftorque is to be applied it is frequently desirable to shift the handenthev handle, which is not a simple matter to accomplish in a tool of thecharacter illustrated in the above said application.

One of the objects of this invention is tc provide an arrangement sothat torque may be applied by an oscillating motion oif the hand or atwisting back and forth of the. handle of the screw driver. y Y.

Another object of this invention is to provide an arrangement so thatafter a certain predetermined amount ci' torque is applied to the workthis will be held in this position while the handle is rotated to get anew .grip on the work. Another object of this invention 'is to provide aratchet motion between the handle and the work driving blade of thetool.

With these and other objects in view, the invention consists of certainnovel features of construction, as will be more fully described andparticularly pointed out in the appended claims.

in the accompanying drawings:

Fig. 1 is an elevation of my tool;

Fig. 2 is a sectional view taken longitudinally through the tool;

Fig. 3 is a section on substantially line 3-3 of Fig. 2;

Fig. 4 is an end view on substantially line --d of Fig. l;

Fig. 5 is a fragmental view partly in section showing on a larger yscalethe ratchet mechanism of the device.

In proceeding with this invention I provide a work engaging member fromwhich there extends two or more ribbons of spring steel stock throughwhich a twisting torque may be applied to the work. A handle is providedwhich is rotatably mounted with reference to the spring steel membersand which is connected to them through a ratchet mechanism. A tubularbody is utilized as a convenient means for housing o-r protecting theribbon steel members and also as a mounting for one part of my ratchetwhereby the torque which has been applied to the members 2 will be heldwhile the handle is reversely` rotated for a new grip.

With reference to the drawings lll designates the work engaging memberwhichv in this case is the blade of a screw driver. A pair of Vresilientsteel ribbons H are riveted at one of their ends as at l2 to the upperend of the work engaging member i3 and they are secured to a ro-A tatingmember l5 lby a rivet I3. The member l5 isr formed of two partscomprising a reduced squared portion lil for connectionv with the largerportion l5 for the transmission of turning moment. A tubular housing i6is fixed to the member i0 by a rivet il and encloses the ribbon steelmembers Il and also provides a mounting i8 for-the shaft I4 by reason ofthe ball bearing le ywhich is mounted in the enlarged portion i3 of thisbody housing. This housing or body carries an indicating plate 23 whichis iiXed with refer` ence thereto. A handle 2l is provided with abushing'22 which is freely rotatable upon the shaft l5 and rotatablyheld in position by a bolt Z3 having head 24 and washer 25, the samebe-` ing threaded as at 23 into the shaft i5 againsta shoulder 2l whichis formed on the bolt 23.

The shaft I3 is provided with asquared portion V2l upon which a pointer28 is lixedly mounted so as to extend out and sweep over the indicatingplate 2B. Upon this squared portion 2l of this shaft i5 there aremounted two ratchet plates 3i) and 3i each having teeth 32 and l33 onthe distant side thereof and facing in the same rotative direction.A'pawl 3i slides in a recess 35 and is pressed by spring 36, alsohousing in recess 35 of the handle so as to cause this pawl to engagethe teeth 32, while a pawl 31 guided in a recess 38 is pressed by spring33 into engagement with the teeth 33. This recess 38is formed in a plugl0 which threadingly engages the housing I8 and is fixed in relationthereto, while this plug provides a free passage for the shaft I5 tofreely rotate therein.

As the handle is rotated clockwise when viewed toward its handle end,the pawl 34 will enga-ge the teeth 32 and turn the shaft I5 andthroughthe ribbon members Il will turn the blade l0, unless theresistance is too great in which case twistl ing these ribbon memberswill take place. At the same time the ratchet 3l will be rotated so thatits pawl will snap by the teeth 33 successively and will be held againsta returning motion which the setting up of the members Il tends t'oproduce. Thus, with the tension held by the pawl 33 the handle 2| may berotated reversely or backwardly so as to get a new grip and again applytension the lever is moved about the'pivot 43 in a clock;

wise direction.

I claim: Y 1. In a tool, a body, a work engaging member fixed to one endthereof, resilient ribbon strips fixed at one end to said memberA andextending' longituidnally of the body and flexible whenjtorsion stressesare applied thereto, ashaft fixed to the other end of said strips andextending longitudinally of thebody, a handle rotatably mounted withreference to said shaft, and paWl and ratchet means connecting saidhandle to said shaft for applying a torsion force thereto,'and meansoperatively connected to said strips and said shaft for indicating theamount of twisting of said strips.

2. In a tool, a body, a work engaging member fixed to one end thereof,resilient ribbon strips xed at one end to said member and extendinglongitudinally of the body and flexible when. torsion stresses areapplied thereto, a shaft fixed to the other end of said strips andextending longitudinally of the body, a handle rotatably mounted withreference to said shaft, and pawl and ratchet means connecting saidhandle to said shaft and a second oppositely acting paw] and ratchetYmeans for connecting said shaft to said body for fixed toone Vendthereof, resilient ribbon strips xed at oneeend to said member andextending longitudinally of the body, a shaft fixed to the other end ofsaid strips and extending longitudinally of the body, a handle rotatablymountedwith reference to said shaft, paWl andV ratchet meansconnecting"'said handle to said `shaft,"a second oppositely acting pawland ratchet means for connecting said shaft to said body, a pointer 50carried by said shaft and a scale on said body over which said pointeroperates. l

1i. In a tool, a body, a` Work engaging member. Y

fixed to one end thereof, resilient ribbon strips fixed at one end tosaid member and extending longitudinally of the body, a shaft fixedV tothe other end of said vstrips and extending longitudinally of the bodyhaving an out of round portion thereof, a pointer on said out of'roundportion, ratchets on said portion on either side of Y said pointer, ahandle rotatably mounted with reference to said shaft, a paWl carriedby,` said handle to lock with one ratchet upon movementV Vin onedirection slipping by said ratchet in the other direction, and a pawlcarried by said bodyV to engage the other said ratchet and hold saidshaft while the handle is reversely rotated for a new grip, and a scalecarried'by the body Vover which the pointer moves. Y

5. In a tool, a body, a work engagingfmember at one end of the body anda handle member at the other end of the body, means to connect saidmembers vcomprising resilient ribbon'strips within said body fixed atone end to one member to rotate therewith, an element connected toandextending from said strips at the other end of said strips and doublepawl and ratchet means connecting said element to the other member andWILLIAM STORRIE. REFERENCES CITED The following references are of recordin the le of this patent:

UNITED STATES PATENTS Number Name Y l' Date 80,622 Goss Aug. 4, v18681,862,470 Edstrom 111 June 7, 1932 2,205,510 Wolfram June 25, v1%02,074,079 Barr et ai. f .Mar.1v6,1937 2,283,888 Zimmermann Mayf19, 1942164,100 Plymale bhne 8,1875' FOREIGN PATENTS f Number Country DateGerman (seht/ahlen)Y Nov. 25,19214

